Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56439a75d9187be…

MALICIOUS

PDF

96.6 KB Created: 2021-07-24 17:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f85585ccf24e1993ef5f5fb1c34940ae SHA-1: 3009f7f1bf20c9416539fb27aeb7e53d0f68bdbd SHA-256: c56439a75d9187be47f58d308f2e8b61748275a5cca6bcf3f0076d757105f424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads. This structure strongly suggests a link farm designed to host or redirect to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ffd0a154a---45114034997.pdf In PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c4e8c2c42---85779967033.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/vuzonojirom.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/64265681052.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/bepedesurolubekeso.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/gosijalopovowad.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e44655eabf---bumigewabo.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8b5727700---kemexiwodumumevefemafeto.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d48791a83a---razimekalarogasivafolilab.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/tarawe.pdfIn PDF document text
    • http://northcity.rs/slike/files/10953123671.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218e6dc90b---37805930900.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3efccd8b52---xuxomedafudotiwiv.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1e08c7729e166897ab8205dbeb68c6b2/genugujalofajuzekoj.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f6ec92c29284b1de1815efe857bb4a9c/gulaxa.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/5f1830f45576e093d83804d5db4b544c/13839038477.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/80830419507.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9106432361---13028344692.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/8051160540.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/lodajataxutiwulu.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/sulix.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/64044698359.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/b261ff6f6c242458ba3f6f4c86e1c43e/35234647057.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08301b9a0fc8879e3229a1b0be5b29b8/74194921112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=is+acca+ethics+and+professional+skills+module+compulsoryPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 18192 bytes
SHA-256: fdd7c824c695f68e9f7ec48e11ac5ea225d0043a028486f1a02885d73cb66f17
font_01_sfnt_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 11140 bytes
SHA-256: 6aadcac5efbab6180a42ba164dc61b5e41e52dbdc1dade49e7f2d56569b511e9
font_02_sfnt_off00015af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1